<strong>Profundal oligochaete faunas (Annelida, Clitellata) in Japanese lakes</strong>

Abstract

Thirty-eight species of oligochaetes (Annelida, Clitellata) belonging to five families were recorded from profundal bottoms of 50 freshwater lakes on Japanese islands. They were mostly widely distributed species, and the composition of fauna is basically explained by the scheme of Timm (2012), with parallel replacement of European species. Oxygen, temperature and surrounding fauna could be main factors determining the profundal fauna in the lakes. The lumbriculids (Styloscolex japonicus, Yamaguchia toyensis and Lumbriculus variegatus), haplotaxids (Haplotaxis gordioides) and enchytraeids (Marionina klaskisharum) were restricted to several deep and oligotrophic lakes located in Hokkaido and northern Honshu, where Rhyacodrilus komarovi often accompanied them. Limnodrilus hoffmeisteri was the commonest species, occurring irrespective of the trophic status and bottom temperature of the lake. Tubifex tubifex also occurred in wide trophic scale, but it has never been found in shallow eutrophic lakes where the bottom temperature exceeds 15°C, where L. hoffmeisteri, Branchiura sowerbyi and several Aulodrilus species were the main representatives.

Macrozoobenthic communities of the saline Bolshaya Samoroda River (Lower Volga region, Russia): species composition, density, biomass and production

“…Oligochaetes L. profundicola and N. elinguis reached very high abundances in the B. Samoroda River. Euryhaline L. profundicola is known from the profundal of Lake Baikal (Timm 2012), in lakes and rivers of Kamchatka and in the southern areas of the Russian Far East (Semernoi and Sidorov 1913), Western Europe (Atanackovic et al 2013), North America (Popchenko 1988) and Japan (Ohtaka 2014).…”

Variability of benthic methane‐derived carbon along seasonal, biological, and sedimentary gradients in a polymictic lake

“…Stable isotopic compositions of oligochaetes were measured without species identification in the present study. Previous studies showed a total of 13 species of oligochaetes were observed in Lake Kasumigaura (Ohtaka 2014), and their life cycles and ecological behaviors were different among species (e.g., Carroll and Dorris 1972; Yasuda and Okino 1987; Ohtaka 1992; Ohtaka and Kikuchi 1997), suggesting interspecific differences may affect variability of δ 13 C and δ 15 N. In future studies, interspecific differences of methane‐derived carbon contributions should be examined to understand ecological roles of oligochaetes in methane dynamics.…”

<p class="HeadingRunIn"><strong>New species and new records of Japanese Lumbriculidae (Annelida, Clitellata)</strong></p>

“…3.3.2 Hrabea ogumai Yamaguchi, 1936(Yamaguchi 1936a, 1953Fend & Ohtaka 2004) *Lamprortus orientalis 3.1 New record Lumbriculus multiatriatus Yamaguchi, 1937(Yamaguchi 1937a, 1953, Cook 1971, Sokolskaya 1972a, Timm & Rodriguez 1994, Timm 1999) Lumbriculus japonicus Yamaguchi, 1936(Yamaguchi 1953, Timm 1997, 1999 =Lumbriculus variegatus japonicus Yamaguchi, 1936(Cook 1971) Lumbriculus mukoensis Yamaguchi,1953(Timm 1997, 1999, Torii & Ohtaka 2007 =Lumbriculus variegatus mukoensis Yamaguchi, 1953(Cook 1971) Lumbriculus variegatus (Müller, 1774) (Yamaguchi 1953) Rhynchelmis orientalis Yamaguchi, 1936(Cook 1971, Kaygorodova & Liventseva 2007, Fend & Brinkhurst 2010, Fend & Lenat 2010) Styloscolex (Styloscolex) japonicus Yamaguchi, 1937 = Styloscolex japonicus Yamaguchi, 1937(Yamaguchi 1937b, 1953, Cook 1971, Ohtaka 2014, Sokolskaya 1976, Timm 1997, 1999, Timm & Všivkova 2007, Rodriguez et al 2014) *Styloscolex (Styloscolex) tazawaensis n. sp.…”

“…The Japanese records and descriptions are largely the work of Hideji Yamaguchi (1936aYamaguchi ( , 1936bYamaguchi ( , 1937aYamaguchi ( , 1937bYamaguchi ( , 1953, who described 6 endemic species, including the monotypic Hrabea ogumai Yamaguchi, 1936, and also reported the apparently cosmopolitan Lumbriculus variegatus (Müller, 1774). Since then, additional lumbriculid distribution records have been presented by Ohtaka & Nishino (1995), Torii & Ohtaka (2007), Fend & Brinkhurst (2010) and Ohtaka (2014); and a single new species, Yamaguchia toyensis Fend & Ohtaka, 2004, has been described.…”